Huh. This actually sounds pretty good!
So, if I've got this correct, a Cleric 6/Wizard 3 would have 4 1st level slots, 3 slots each for 2nd, 3rd, and fourth level spells, and 1 5th level spell slot, knows 4 Cleric cantrips and 3 Wizard cantrips, and (assuming an ability score of 16 in WIS and...